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- Chemical control of wall vegetation - neutralisation of herbicidesPublication . Mouga, Teresa; Almeida, M. T.; Rosa, P. J.The chemical control of limestone-growing wall vegetation has to be made carefully, to prevent damage caused by acid herbicides. The results obtained with a new methodology of herbicide neutralisation by potassium hydroxide are here presented. This neutralisation proved its efficiency both in killing the plantsand decreasing the damage caused to the stone.